Cement composition



Patented Mar. 10, 1925.

3 UNITED STATES- PATENT OFFICE.

GEORGE WITTY, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO NICHOLAS SELVAGGI, OE BROOKLYN, NEW YORK.

CEMENT COMPOSITION.

No Drawing.

To all whom it me concern:

Be it known that GEORGE WITTY, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of .New York, have invented a new and use-. ful Improvement in Cement Composition;

- and I do hereby declare the following to be a full, clear, and exact description of the invention.

The object of the invention is to provide an improved cement which will be hard,

fire-proof, sound-proof, water roof and a non-conductor of heat, sound and electrici I prefer to use the ingredients thoroughly Y mixed and in about the following proportions: 40 pounds crude gypsum, 20 pounds marble dust or coarse silica, 20 pounds dextrin, 10 pounds hard-wood saw-dust, 5 .pounds barium sulphate, 5 pounds barite;

total 100.

' From experience I have found that'barium sulphate when used alone without the Application filed February 11, 1924. Serial No. 692,171.

addition of the bariteresults in a quick setting product; when-used with the other in-' gredients of my composition while with the addition of barite'a retardation in the setting is produced thereby affording oppor- 40 tunity of applying the composition. Furthermore, the addition of the natural barite tends materiallyto retain the barium sulphate an artificial product in suspension whereby the homogeneous mixture of the barium sulphate with the barite and other ingredients is obtained. Dextrin is used. as a binder and not a retarder and the addition of saw-dust produces a better binder and when combined with barite is rendered 5.0 fireroof. y improved cement can be used for floor covering, artificial marble, insulating ordeadening, artificial tile and other kinds of casting ornamental work. Having fully described my invention what I claim as new and desire to secure by Letters Patent is:

Y 1. A cement composition consisting of gypsum,- coarse silica, dextrin, saw-dust,

barium sulphate and barite. I

2. A cement com osition eight parts by weight of gypsum, our parts by weight of coarse silica, four parts by weight of dextrin, two parts by weight of hardwood sawdust, and one part of each by weight of botlibariuni sulphate and barite. In testimony whereof, I have hereunto signed my name to this s ecification.

GEO GE WITTY. 

